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Functional relevance during lymphocyte migration and cellular localization of activated beta1 integrins.
Eur J Immunol. 1997 Jan; 27(1):8-16.EJ

Abstract

The state of integrin activation can be assessed by monoclonal antibodies (mAb) that selectively recognize integrins in their active form. We demonstrate herein that the expression of the epitope recognized by mAb HUTS-21 is induced on T lymphoblasts upon binding of soluble vascular cell adhesion molecule (VCAM)-1 and an 80-kDa tryptic fragment of fibronectin (FN80) to the beta1 integrins very late activation antigen (VLA)-4 and VLA-5, and that this effect is dependent on ligand concentration and is specific for beta1 integrins. On T lymphoblasts adhering to immobilized fibronectin, the HUTS-21 epitope localized exclusively to sites of integrin binding to fibronectin. These results indicate that mAb HUTS-21 recognizes a ligand-induced binding site (LIBS) on the common beta1 subunit of VLA proteins. Engagement of beta1 integrins through this LIBS epitope inhibited T lymphoblast movement on fibronectin, as determined by quantitative time-lapse video microscopy studies. Furthermore, the HUTS-21 mAb also prevented T lymphoblast-directed migration through gradients of substratum-immobilized beta1 integrin ligands such as fibronectin or VCAM-1, whereas it did not affect migration on intercellular adhesion molecule (ICAM)-1. This anti-LIBS mAb stimulated cell adhesion through postreceptor events, without affecting receptor affinity for ligand, and appears to interfere with cell migration by a mechanism distinct from that of other anti-beta1 activating antibodies.

Authors+Show Affiliations

Servicio de Immunología, Hospital de la Princesa-U.A.M., Madrid, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9021992

Citation

Gómez, M, et al. "Functional Relevance During Lymphocyte Migration and Cellular Localization of Activated Beta1 Integrins." European Journal of Immunology, vol. 27, no. 1, 1997, pp. 8-16.
Gómez M, Luque A, del Pozo MA, et al. Functional relevance during lymphocyte migration and cellular localization of activated beta1 integrins. Eur J Immunol. 1997;27(1):8-16.
Gómez, M., Luque, A., del Pozo, M. A., Hogg, N., Sánchez-Madrid, F., & Cabañas, C. (1997). Functional relevance during lymphocyte migration and cellular localization of activated beta1 integrins. European Journal of Immunology, 27(1), 8-16.
Gómez M, et al. Functional Relevance During Lymphocyte Migration and Cellular Localization of Activated Beta1 Integrins. Eur J Immunol. 1997;27(1):8-16. PubMed PMID: 9021992.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional relevance during lymphocyte migration and cellular localization of activated beta1 integrins. AU - Gómez,M, AU - Luque,A, AU - del Pozo,M A, AU - Hogg,N, AU - Sánchez-Madrid,F, AU - Cabañas,C, PY - 1997/1/1/pubmed PY - 1997/1/1/medline PY - 1997/1/1/entrez SP - 8 EP - 16 JF - European journal of immunology JO - Eur J Immunol VL - 27 IS - 1 N2 - The state of integrin activation can be assessed by monoclonal antibodies (mAb) that selectively recognize integrins in their active form. We demonstrate herein that the expression of the epitope recognized by mAb HUTS-21 is induced on T lymphoblasts upon binding of soluble vascular cell adhesion molecule (VCAM)-1 and an 80-kDa tryptic fragment of fibronectin (FN80) to the beta1 integrins very late activation antigen (VLA)-4 and VLA-5, and that this effect is dependent on ligand concentration and is specific for beta1 integrins. On T lymphoblasts adhering to immobilized fibronectin, the HUTS-21 epitope localized exclusively to sites of integrin binding to fibronectin. These results indicate that mAb HUTS-21 recognizes a ligand-induced binding site (LIBS) on the common beta1 subunit of VLA proteins. Engagement of beta1 integrins through this LIBS epitope inhibited T lymphoblast movement on fibronectin, as determined by quantitative time-lapse video microscopy studies. Furthermore, the HUTS-21 mAb also prevented T lymphoblast-directed migration through gradients of substratum-immobilized beta1 integrin ligands such as fibronectin or VCAM-1, whereas it did not affect migration on intercellular adhesion molecule (ICAM)-1. This anti-LIBS mAb stimulated cell adhesion through postreceptor events, without affecting receptor affinity for ligand, and appears to interfere with cell migration by a mechanism distinct from that of other anti-beta1 activating antibodies. SN - 0014-2980 UR - https://www.unboundmedicine.com/medline/citation/9021992/Functional_relevance_during_lymphocyte_migration_and_cellular_localization_of_activated_beta1_integrins_ L2 - https://doi.org/10.1002/eji.1830270103 DB - PRIME DP - Unbound Medicine ER -